Changeset 20397

When enabling MFP, hostapd will read assoc_sa_query_max_timeout and
assoc_sa_query_retry_timeout from it's config file. Make these options
configurable in /etc/config/wireless. To make it clear that these
options are 802.11w related, I named them ieee80211w_max_timeout and
ieee80211w_retry_timeout instead.